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Yeah, I looked at those. Given the size of the soil pipe where it goes from the main bathroom into the floor level boxing in the ensuite, I'm pretty sure the frame would end up resting on the soil pipe. I'm no plumber, but I'm assuming that would be a bad idea.
e: Also, because I'm not having a wall-mounted pan, a frame like that seems overkill just for holding the cistern in place.
Doesn't answer your question but my builder fitted this. It is magic.
e: never mind, see your comment about horizontal soil. boo.
ee: actually maybe you're ok, looking at this page.